At a Comic-Con panel Thursday, "Under the Dome" star Mike Vogel teased the possibility of some of the characters leaving the impenetrable dome that encompasses the town of Chester's Mill, Maine, on the TV drama.

"A lot of people said, 'How do you maintain a show under a dome year after year?'" he said. "They've come up with a really exciting and interesting way of broadening the scope of our world. I think everyone's in for a real treat once that happens."

"Under the Dome" is airing its second season Monday nights on CBS (10 p.m. EDT).

Cast member Rachelle Lefevre said viewers will also see more about how the outside world is reacting to the dome.

"This season you will get your first glimpse of what the impact of the dome has been," she said.

And the death toll will rise, with producers not afraid to kill off main cast members.

"When you're dead, you're dead, but that doesn't mean you can't be an avatar at some point and come back," teased executive producer Neal Baer.

The four-day festival celebrating film, TV, video games, comic books, costumes and other popular arts continues through Sunday at the San Diego Convention Center.

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